Yes you should, because the installation file is not updated each time we do a patch, as this is a relatively cumbersome process involving testing on several machines. If you have Internet but can't connect, then please contact the Slitherine Helpdesk here: support@slitherine.co.uk

Hofstadter's Law: "It always takes longer than you expect, even when you take into account Hofstadter's law."